Abstract：A preliminary study based on the breeding ecology of red-winged laughingthrush (Trochalopteron formosum) was conducted during the breeding seasons from 2014 to 2016 in Laojunshan National Nature Reserve, Pingshan county, Sichuan province, China. The results showed that the breeding period of T. formosum was from late April to mid-September. In 2016, the breeding population density was 14.733 ind./km2 (95% confidence interval:11.727-18.511|coefficient of variation:0.115). Nests were found mainly in bamboo (Chimonobambusa szechuanensis). In addition, the female laid an egg in the morning during the egg-laying period, and the average clutch size was 2.28 eggs±0.09 eggs (n=24, range=2-3 eggs). The incubation period was 14-15 days, and the hatching rate was about 59.6%. The nestling period was 14 days, and the fledging rate was about 50.0%. Nest predation was the primary factor causing breeding failure of T. formosum. The species preferred nest-sites with less arbor and more tall bamboo, and the coverage of trees might be the key factor affecting the nest-site selection of T. formosum.